Plug.



A. F., 0. B. & W. F. BAHR.

PLUG.

APPLICATION FILED FB.ll,1915- 1 ]I 66 3 1 U Patented Dec. 28, 1915.

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AMEL F. BAHR, OTTO B. BAHR, AND WILLIAM F. BAT-IR, OF MAR-ION, INDIANA.

PLUG.

Specification of Letters Patent.

Patented Dec. as, was.

Application filed February 11, 1915. Serial No. 7,614.

To all whom it may concern:

Be it known that we, AMEL F. BAHR, OTTO B. BAHR, and WILLIAM F. BAI-IR, citi- Zens of the United States, residing at Marion, in the county of Grant and State of Indiana, have invented certain new and useful Improvements in Plugs, of which the following is a specification.

This invention relates to improvements in paper pulp mills and particularly to fillings, known as plugs, employed in continuous beater engines for refining paper pulp, and means for holding the plug upon its supporting shaft. These plugs are generally of frusto-conical body formation and embody knives or ribs which project externally of their surface and are adapted to coact with internally ribbed shells in which the plugs are revolved at a high rate of speed.

We are aware of substantially only two well known methods of forming plugs used in this art, first, wherein they are constructed of wood with steel knives or ribs inserted at regular intervals; second, wherein the construction follows the method of inserting steel knives into a mold, the bases of which knives have been tinned, and then pouring molten metal into the molds to form the complete plug, the last method being described in Patent Number 86%,359. Both of these constructions of plugs are highly unsatisfactory we have found by long experience in this particular art, the first one be cause the knives are so easily torn loose, requiring shutting down of the mill until repairs can be made, and the second because the molding process has a tendency to crystallize the steel of the knives which causes them to break easily during use of the plugs.

Now, therefore, with this in view, the essence of our invention lies in the construction of these plugs together with the knives by casting said plugs of one body metal,- a mixture of steel and ironof both sufficient hardness to withstand abrasive wear and toughness to prevent breakage should foreign substances be encountered in the pulp stock. The blades being integral with the plug body and of homogeneous material do not in actual experience break off and advantageously resist the action of acids of the pulp as well as enhance the refining action by coaction with the steel blades of the shell. These and such other objects as may hereinafter appear are attained by the novel construction, combination, and arrangement of parts to be hereinafter specifically described and claimed. I

Reference will now be had to the accompanying drawing forming a part of this specification wherein:

l1 igure 1 is a side elevation of a plug or filling constructed in accordance with our invention. Fi g. 2 is a top plan view thereof, certain sections of the plug shell being omitted. Fig. 3 is a sectional view taken on the plane indicated by the line 3-3 of Fig. 2. Fig. f is a fragmentary sectional View showing more clearly the manner of attaching the plug segments in place. Fig. 5 is a detail perspective view of one of the segments alone.

Throughout the following detail description, and on the several figures of the drawings similar parts are referred to by like reference characters.

Referring to the drawing, it will be noted that the embodiment of our invention consists of a plug or filling member of hollow frusto-conical formation, the body of which is made up of a plurality of triangular shaped sections designated 1, each of which sections has formed integrally therewith a plurality of blades 2. The foregoing sections or segmental plates are attached to a core 3 by means of fastening bolts 4 passing therethrough as best shown by reference to Figs. 8 and 4. The plates arcinsertedbetween longitudinal ribs 5 carried by the core 3 and which assist in holding the plates in proper position against the strain exerted during the grinding action when the device is in use.

As hereinbefore premised the important feature of our filling device is the integrality of the blades with the body of the plug and said plates and body being of a homogeneous character. The body being made up of a plurality of longitudinal sections which are triangular in shape overcomes the difliculties which would ordinarily be encountered in the molding of a conical body having blades, which as will be noted by reference to the drawing, extends angularly of the body with reference to its longitudinal axis. The segmental formation furthermore enables the replacement of any section which may be accidentally damaged by encountering foreign substances in the grinding operation or become Worn and obviously this prolongs the use oi a filling very materially as well as insures the proper comminution of detachably connected to the plug body by means of the bolts or similar fastening members 9. By means of the above described arrangement the plug is held against accidental lateral movement or movement longitudinally of its shaft when the mill is adjusted to obtain the different degrees of comminu tion of the material being acted upon.

Having thus described the invention, what We claim as new is:

1. A plug for paper pulp refining engines comprising a conical body consisting of a plurality of sections of substantially triangular shape, each section having formed thereon integral blades of a. homogeneous material with the body and extending longitudinally of said body.

2. A plug for paper pulp refining engines comprising a conical body consisting of a plurality of sections of substantially triangular shape, each section having formed thereon integral blades of a homogeneous material with the body and extending longitudinally of said body, a core to which said sections are secured and having spaced ribs thereon between which the sections are interposed, and fastening members for attaching said sections to the core.

In testimony whereof we ailiX our signatures in presence of two witnesses.

AMEL F. BAHR. OTTO B. BARR. YVILLIAM F. BAHR. Witnesses PETER GATsoHALL, Gno. W. COTTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

